The MOD-ENC28J60 is an easy way to add 10 Mbit ethernet to an existing system. It can connect to your system via a 2x5-pin ribbon cable on the UEXT connector (which is present on many Olimex boards; see below), or mounted directly on your PCB.

UEXT Connector

The UEXT connector can be used to connect this Ethernet module to a system with a microcontroller. There are dozens of microcontroller systems and development boards that can connect to this module via UEXT using the supplied cable. Click on the architectures below for lists of compatible boards: